I don't know if Underfoot is the same since the F2P client was updated. You can check it here:
http://www.eqemulator.net/wiki/wikka...ClientVersions
If it is actually Underfoot, then the download is missing files. You'll need to copy them from another client or live, and you can find a list here:
http://www.eqemulator.net/wiki/wikka...ssingFilesList